Why can't I win????
To the OP don't guess on what you need. You have to find someone who is competent and can tell you what's going on, if anything. Could be a myriad of issues or just as simple as a bad tune. Either way don't throw money at it or parts. Pay for a dyno and/or some diagnostics first. Based on what you have you should at least be able to hang with them.
One thing that isn't adding up is that the '99 EFI bikes came with 3.37 final drives; you should have that going for you. I would pull the chain case cover and verify the tooth count on the sprockets and the tooth count on the trans and wheel pulleys. I know 88" bikes with 3.37 gearing and mild cams that will spank a Stage I 96"er.
Yes, you should be thinking about head work and more cam (TW37) to go along with the headwork and more compression; a simple BigBoyz street port would make a big difference. A 2:1 pipe would help but the duals are not your problem and Fullsac makes a good system.
Get the compression and leak down test done, post the results and there is enough help on this forum to put you back in the hunt with your two riding buddies.
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